/Engine/Plugins/Protocols/MQTT/Source/MQTTCore/Public/MQTTSubsystem.h
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, BlueprintPure, Category="MQTT", Meta=(DefaultToSelf="InParent")) static bool GetPayloadJson ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * InParent, const [FMQTTClientMessage](API\Plugins\MQTTCore\FMQTTClientMessage) & InClientMessage, [FJsonObjectWrapper](API\Runtime\JsonUtilities\FJsonObjectWrapper) & OutJson )